Custom endpoint setup (_model_flow_custom) now probes the server first
and presents detected models instead of asking users to type blind:
- Single model: auto-confirms with Y/n prompt
- Multiple models: numbered list picker, or type a name
- No models / probe failed: falls back to manual input
Context length prompt also moved after model selection so the user sees
the verified endpoint before being asked for details.
All recent fixes preserved: config dict sync (#4172), api_key
persistence (#4182), no save_env_value for URLs (#4165).
Inspired by PR #4194 by sudoingX — re-implemented against current main.
Co-authored-by: Xpress AI (Dip KD) <200180104+sudoingX@users.noreply.github.com>
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